According to the New York Post, DiLeo behind a number of personal accounts and footage, during which he talked about Jackson. The documents have since been compiled into the post-humus biography DiLeo: I Am Going To Set The Record Straight by his former business partner Mark Lamica.
In it, Lamica writes that DiLeo shared his knowledge of a planned Mafia contract to kill Michael Jackson - and how he managed to stop it from happening.
DiLeo also spoke extensively about Jackson's changing appearance.
Lamica said: "Michael told Frank in a phone call that he couldn't bear to see his father's [Joseph Jackson] face when he looked in the mirror.
"Frank had told him he needed to stop changing his face, because he was becoming unrecognisable to his fans."
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Lamica also claims the book will include details about his Neverland Ranch deal with Colony Capital and his record label, as well as "naming and shaming" those in the industry DiLeo felt had exploited him.
The release date for the book is yet to be confirmed.
A spokesperson for Michael Jackson's estate is yet to comment on the claims.
- Independent